Method of drawing hollow glass articles.



N0; 841-,011. PATENTED JAN. 8, 1907-. T. F. HART. METHOD OF DRAWING HOLLOW GLASS ARTICLES.

APPLICATION FILED FEB. 27, 1905v 2 SHEETS-SHEET 1.

WITNESSES INVENTQR N0. 841,011. PATENTED JAN. 8, 1907.

T. F. HART. METHOD OF DRAWING HOLLOW GLASS ARTICLES.

APPLICATION FILED P33211905.

2 SHEETSSHEET 2.

WITNESSES iNvENTbR w %M. .7, /M Maw 49W w/ M nest-1,011.

THOMAS .r. HART, or Mercia; INDIANA, ssronos ro wnrnow GLASS Manama oonrANv, or rrrrsnnse, V PENNSYLVANKA, A CORPORATEON or NEW JERSEY.

WEETHQD e sesame-Horrors erase seventeen Patented. Jam 190?.

To all whom it may concern:

Be it known that l, THOMAS F. HART, of

Mnncie, Delaware county; Indiana,-'have -,invented a new and usei'ul"lrnprovementliinthe Method of Drawing Hollow GlassfArticles, of which thefollowing is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which.

Figure l is a sectional front ele'vationshow. 111g apparatus for carrying out my invention; and Big is a side elevation, partly broken away Heretofo're in the drawing of hollow glass articles wherein the pot or receptacle was heated during the drawing operation it has been necessary to chill the glass at or near the drawing-point either by means of a cooling.

ring, through which a duid'was fed, or by jets of-air or by some other special chilling device. In the process heretofore used a hollow chilling-ring encircles the cylinder at or near the drawin -point, and the pot, which is heated from be ow, is provided with means for cutting off the heat from the drawingpoint. I V *I have discovered that where hollow arti cles are drawn from'a pot which is heated during drawing such heatbein kep t a way from the drawing-point, imine iat'e results are obtained by awi'ng hollow glass cylinders or articles without any means applied at or near the awing point. For example, in drawingthose cylinders for makingwindowlass which are known as single thick It chilhn device is done away with the glass Wills and take its sha e merely from the influence of the atmosp ere. I have also found that where glass cylinders or'hollow articles are drawn ulpwardly in the open air the air-currents in t e building are liable to crack and injure the "glass, especially where,

it is drawn in long lengths. I have overcome this difficulty by providing a shield or chamber which is arranged to at least partially inclose the cylinder during the drawing operation. y In the drawings; in whichpl show one form joint which Wii 7 heated current from the glass at the drawing.

s ecial chilling; (ii

ave found that when the I of apparatus for carrying out my invention,

2 represents the drawing pot, which may be either a single pot or of the double reversible type set forth in the Thomburg Patent No. 759,329, dated May 10, 1904; l. have shown the pot as of double form, having opposite cavities 3 3 for receiving the glass, so that one is upside down while the drawing operatlon is being carried out from the upper-one.

This pot is preferably formed in one integral piece of clay with projecting integral side. trunnions 4; 4-, preferably polygonal in crosssection at their outer ends and cylindricalin cross-section where they extend through the slots or holesin the side walls 5 5- of the furnace.- chamber. This furnace is shown as of square or rectangular form, with outer steel or iron plates 6 incloslng the brick or other refractory linin 5; g g hole of en stantially t e SlZfi'bf the pot-cavity and is beveled around the hole, asshown at 8, to make a neat fit with the corres" endingly-beveleded e of'the pot,thus'1na g a 5 Substantially out on the point, The side walls are vertically slotte as shown at 9', for a portion; of'their length,

The to stone 7 has a central and between the slotted refractory lining and within the bottom of the forked portion and arexactuated by links 17 pivotally connected with levers 18; secured to a common shaft 19. The construction is the same as to the o crating mechanism at each 'side, and asing e hand-lever 211 is used to rock the shaft 19, and thus turn the pot on its trunnions.

' The vertical standards 14 extend through dovetailed guideways 21 and at the lower 5 I octagonal or other 'pimons engaging short racks it}, which slide end are connected b short links 22 with levers 23 ,pivoted to .t e sides of the furnace at 24. The links 22 are formed in tw'o parts, with st-turnbuckle connection between these parts havin a right and left hand screwthread, so t at by turning the nut the link may be varied in length, thereby adjusting one side relatively to the other, so that .the pot will be horizontal or will fit. neatly a ainst the sealing joint with the top stone. T e levers 23. are provided attheir ends with segmental racks 25, engaging segmental inions 27, -on a common. shaft 26,- whic is rocked by a suitable hand-lever 28. By

rockin this lever the pot maylbe raised and.

lowere within the furnace-chamber. The handle 28' has. a spring-pressed catch 29,

' which engages teeth on the fixed segment. 27,

so that the pot may be locked in any desired position. I, J v

The furnace-body rests upon a suitable refractory foundation 30, carried on I -beams 31, extending. across a lowercave or'tunnel under the furnace, the foundation having a a central eye 32 of cylindrical form, into which are-directed a number of s-jets 33.

I These as-jetslead in fromthe si es and are thence ent u wardly, and the jet oftsgas and i the flames sue the air upwardly nto the eye,

where it mixes and produces an-inten'se combustion.

: To cool the furnace-plate, I preferably pro vide .an air-s ace between the outer plates and the brick inin and to provide an outlet for thehot air an gases I rovide slots 35 along the lower edges of the side lates.

In order to take the weights 0 the shields 10 dd from the pot-trunnions, I preferably provide veQtical su ports 36 on the bearings 13 to which are ad ustably secured hooked r0 8 37, engaging eyebolts 38, secured to the to. s of the shiel' s. v

- 11 order to inolose the glass'cylinder durmg its drawing, I proyideanmclosuie which at'least partially shields the cylinder from air-currents and exterior influences, In the form shown this consists oi'a casing having sides 39 and a back 40 the casing being in the form of a long vertical box open at the front. This casing preferably extends a sufficient distance to inclos'e the cylinder ter the-drawing operation is com lete'd. It maybe extended more or less in 1y around the article and serves to protect it during the time of dr'awin by providing around the "same a substantially confined atmosphere.

In using the apparatus no chilling-ring and no other chilling, device, such as an air-blast or other means, is employed for chilling the lass ator near the drawing-point. The

alt is lowered into the glass in the. usual manner, the cap is preferably formed as m the process heretofore employed, and the or article af-- glass cylinder is then drawn upwardly, the setting or shaping at the drawing-point taking place merely under the cooling action of the atmosphere. The article is then removed laterallyfrom the casing, and preferably lowered upon a support for-cracking ofi' prelimi nary to flattening.

The advantages of my invention result from doing away with the necessity for the chilling device and the immediate results obtained thereby. The apparatus is also made simpler and more easily operated. The shle d or casing acts to assist in preventin cracking of the cylinder during drawing an cuts ofi currents of air. I j i The form of the 'cas'ingor shield may be varied widely, and many variations may be '80 made the form and arrangement of the apparatus without departing from my in vention, since I consider myself the first to draw a hollow glass article from a heated po without the use-of any chilling device.

I claim 1 The method of drawing hollow glass articles, consisting in applying heat to a pot or receptacle containin molten glass, protects ing the lass at the rawin' -point from such applied eat, draw-"in a ho low glass article upwardly from the ath, and cooling the g ass and causing it to set solely b the action of the atmosphere; substantia ly as described. i

2. The method of drawing hollow glass articles, consisting in heatinga pot or rece tacle containing molten glass, cutting off suc heat from the drawing-point, drawing ahollow c linder upwardly from the receptacle, sup- I00 ying air under pressure to the interior of the article, and cooling'the glass and causing it to set at the drawing-point solely by atmospheric action; substantially as described.

3. The'method of forming hollow glass ar- 5 ticles, consisting drawing the article up r wardly within an mclosure arran ed to surround the articles with a practical y confined atmosphere throu' out. their length, and supplying air to t e interior of the article I10 duringdrawfmg; substantially as described.

4.- .he method of formin hollow articles, consisting in drawing them io'rwardly within an inclosed a'tmo here extending substantially the full lengt of the articles, and there- I 5 by protecting them from external influences; substantially as described. p I

.5. The method of forming hollow articles,

consisting in drawin' the'article upwardly within a partial inc osure extending substantiall I the full length of the articles, and arrange to surround the same by a quiescent atmosphere, allowings-access to the drawing during drawing, and then removing the article later-allv from the inclosure; sub- 5 stantially' as described.

6. The method of forming hollow lass articles, consisting in drawing the ho low inclosed g'lass article upwardly from a bath of molten glass, applying heat to the pot or receptacle containing the glass from Which'the article is drawn, protecting the glass at the drawing-point from the applied heat, and

cooling the glass being drawn and causing it the action of the atmosphere; subto set bly stantial y as described.

In testimony whereof I have hereunto set my hand.

\ THOMAS F. HART.

Witnesses:

H. T. HUIMA, JOHN MILLER. 

